<template>
  <div>
    <!-- 顶部滑动条 -->
    <div id="slider" class="mui-slider">
      <div
        id="sliderSegmentedControl"
        class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted"
      >
        <div class="mui-scroll">
          <a
            :class="['mui-control-item', item.id == 0 ? 'mui-active' : '']"
            v-for="item in allCategory"
            :key="item.id"
            @click="getPhotoListByCateId(item.id)"
          >{{ item.title }}</a>
        </div>
      </div>
    </div>
    <!-- 图片列表区域 -->
    <ul class="photo-list">
      <li v-for="item in list" :key="item.id">
        <router-link :to="'/home/photoinfo/' + item.id">
          <img v-lazy="item.img_url">
          <div class="info">
            <h1 class="info-title">{{ item.title }}</h1>
            <div class="info-body">{{ item.zhaiyao }}</div>
          </div>
        </router-link>
      </li>
    </ul>
  </div>
</template>
<script>
// 1. 导入 mui 的js文件
import mui from "../../lib/MUI/dist/js/mui.min.js";
import { Toast } from "mint-ui";
export default {
  name: "photolist",
  data() {
    return {
      allCategory: [], // 所有分类的列表数组
      list: [] // 图片列表的数组
    };
  },
  methods: {
    getAllCategory() {
      this.$http.get("api/getimgcategory").then(result => {
        if (result.body.status === 0) {
          result.body.message.unshift({ title: "推荐", id: 0 });
          this.allCategory = result.body.message;
        } else {
          Toast("获取失败");
        }
      });
    },
    getPhotoListByCateId(cateId) {
      // 根据分类id 获取图片列表
      this.$http.get("api/getimages/" + cateId).then(result => {
        if (result.body.status === 0) {
          this.list = result.body.message;
        } else {
          Toast("获取失败");
        }
      });
    }
  },
  mounted() {
    // 当组件的 dom 结构加载并放入页面完成后执行的钩子函数
    // 2. 初始化滑动控件
    // 这类似于 jQuery中的选择器 , 当页面中还没有 .mui-scroll-wrapper这个元素 你就初始化,没有意义
    mui(".mui-scroll-wrapper").scroll({
      deceleration: 0.0005 // flick 减速系数,系数越大 , 滚动越慢,滚动距离越小 , 默认值是0.0006
    });
  },
  activated() {
    this.getAllCategory();
    // 默认 进入页面 , 就主动请求 所有图片列表的数据
    this.getPhotoListByCateId(0);
  }
};
</script>
<style lang="scss" scoped>
* {
  touch-action: pan-y;
}

.photo-list {
  list-style-type: none;
  margin: 0;
  padding: 10px 10px 0 10px;
  li {
    background-color: #ccc;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 0 0 9px #999;
    position: relative;
    img {
      width: 100%;
      vertical-align: middle;
    }
    img[lazy="loading"] {
      width: 40px;
      height: 300px;
      margin: auto;
    }

    .info {
      color: white;
      text-align: left;
      position: absolute;
      bottom: 0;
      background-color: transparent;
      max-height: 84px;
      .info-title {
        font-size: 14px;
        max-width: 200px;
        margin: 5px auto;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
      }
      .info-body {
        font-size: 13px;
      }
    }
  }
}
</style>
